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RS485 Fiber Modem

SPD-E1-D-20-131AS 48v front panel fiber modem.JPG


Product Impression:

  1. Manufacturer: SOPTO

  2. Latest Price: Contact our customer services NOW!

  3. Data Rate: <115.2K

  4. Wavelength: 850nm/1310nm, 1310nm/1550nm for option

  5. Fiber Types: Single mode, Multi-mode

  6. UTP Cable: UTP category 3, 4, 5, 5e cable

  7. Color: White/Grey

  8. Form: Standalone or rack-mount

  9. Diameter of Fiber Core: 50/125,62.5/125 or 100/125μm for multi-mode

  10. Diameter of Fiber Core: 8.3/125,8.7/125,9/125 or 10/125μm for single mode

  11. Fiber core number: double core/single core for option

  12. Fiber Connector Type: SC, FC or ST, optional

  13. Interface Type: RJ45, Fiber, RS485,DCE

  14. E1 Interface Impedance: 75Ω (unbalance), 120Ω (balance)

  15. Transmission Mode: Half duplex or full duplex

  16. Transmission Distance: 2km, 20km, 40km, 60km or customer specified

  17. Sending Consumption:-9dBm/-5dBm

  18. Receiving Sensitivity: <-36dBm (BER<10-11)

  19. Storage Temperature: -40°C ~ 85°C

  20. Operating Temperature: -40°C ~ 70°C

  21. Operating Humidity: 0%~90% RH no condensing

  22. Storage Humidity: 5%~90% RH no condensing

  23. Dimensions: 140(D) X216 (W)X31(H)mm

  24. Weight: 0.3kg, net weight 0.18kg

  25. Power: 48V/110V/220V

  26. Power Consumption: <5W

  27. Manageable or Unmanageable: Manageable or unmanageable are both available

  28. Application: Point to point applications/ Asynchronous application

  29. Browse the Evaluation: Click here to browse


Performance Feature:

  1. Sturdy compact metal case

  2. Auto sense serial signal rate

  3. Plug and play, Hot-swap function

  4. Stand-alone or rack-mount

  5. Duplex data transmission over one fiber

  6. Low power consumption and high reliability

  7. Unique serial port for circuit protection

  8. Supply Point to Point or Daisy Chain connection

  9. LED Status Provide Rapid Indication of Operating Parameters

  10. Supply RS485 interface

  11. Compliance with RoHS and EIA RS-485 standard

  12. Combination of PDH technology and digital lock loop clock technology

  13. Adopt automatic send data control, auto distinguish and control data transfer direction


Note: Part in order to prevail in kind. Please contact customer service before buying.


Quality Certification:

  1. Good Anti-electromagnetic interference (EMI)

  2. Good Electromagnetic compatibility (EMC) which is in accordance with FCC Part15.

  3. Meets ISO9001, TUV, CE, FCC, CAS, UL and RoHS certificates



  1. Advanced dust-free workshop

  2. Experienced technicians

  3. Mature production technology

  4. Standard production process


Information you want to know more:

  1. Reachable Continents: Asia, Europe, Oceania, Africa, the Americas

  2. Arrival Date: 5 to 7 days

  3. Selectable Logistics: FedEx, DHL, TNT, UPS or EMS

  4. Payment Methods: L/C, T/T, Western Union, HSBC, Paypal as well as Cash Payment

  5. Warranty: 1-3 years

  6. Discounts, Promotions and Gifts: Please just contact our online customer services or pay attention to our website.


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Related Read:

  1. Payment methods

  2. Delivery guide

  3. Return & Refund

  4. Guarantee

  5. FAQ


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Definition of RS485 Fiber Modem


RS485 is sometimes termed as RS485 Multi-drop LAN since it can connect several devices in a LAN network environment. These devices are all connected to a single pair wire. Transmit and receive share the same two wires.

RS-485 standard meets the requirements for a truly multi-point communications network, and the standard specifies up to 32 drivers and 32 receivers on a single (2-wire) bus.


Function of RS485 Fiber Modem

RS485 Fiber Modem converts an RS-485 electrical signal into light signals for transmission over fiber optic cable. The fiber modem can be configured to support multimode or single mode fiber with RS-485. With very small and easy use characters, the RS485 fiber modem can solve the problem of communication conflict between distance and rate.  The RS485 Fiber Modem is divided into Dual fiber or Single fiber, the dual fiber optical wavelength up to 850/1310nm and single fiber up to 1310/1550nm.


Application domain of RS485 Fiber Modem


RS-485 is widely used as we can see them from the common desk computer cases. It easily solved the problem of contradiction between communication distance and communication rate of RS485 port.

The main application domain of RS485 Fiber Modem includes military control, industrial control, traffic control, video control, distribute data acquisition system, electric acquisition and control system, intelligent district, highway charging system.


RS232 Network Applicaiton


Different electrical standard interface can be mixed use. If RS-232 Fiber Modem is selected, the maximum transmission distance is 15meters. If RS-485/RS-422 fiber modem is selected, the maximum transmission distance is up to 1900 meters. Optical port supports ST, SC, FC and other interfaces.


RS232 Terminal Pin Assignment

RS-232/RS-485/422 (with the terminal connectors) Terminal Pin Assignment


The RS-232, RS-422/ RS-485 fiber modem interface of modem and user’s devices can be connected with each other via the twisted pair. Modem optical port can be connected to another remote modem optical port with the fiber. When the device is connected correctly and working normally, the corresponding LED indicators will be lit or flashing.



Part No.Description
SPD-RS485-D-20-131ASRS485 Fiber Modem, SM dual fiber,SC/FC connector 220V or 48V
SPD-RS232/485/422-D-20-131ASOptional RS232/485/422 Fiber Modem SM dual fiber,SC/FC connector 220V or 48V
SPD-4RS232/485/422-D-20-132ASOptional 4*RS232/485/422 Fiber Modem SM dual fiber,SC/FC connector 220V or 48V
SPD-8RS232/485/422-D-20-133ASOptional 8*RS232/485/422 Fiber Modem SM dual fiber, SC/FC connector 220V or 48V


Comment Imgae
best price available.
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Always top quality, great prices, fast shipping.
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I could not have been happier with the purchase, and I would definitely recommend this company to others.
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I would recommend this to anyone.

Comment Imgae

Easy to use and seems durable.